POWER STEERING SYSTEM, Diagnostic DTC:C1524/24 and C1555/25

DTC Code DTC Name
C1524/24 Motor Circuit Malfunction
C1555/25 Motor Relay Welding Failure

DESCRIPTION

The power steering ECU assembly supplies current to the power steering motor assembly through the motor circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Return-to-normal Condition

C1524/24

Motor Circuit Malfunction

Short (or open) in motor circuit or abnormal voltage or current in motor circuit

  • Power steering motor assembly

  • Power steering ECU assembly

On

Ignition switch ON again

C1555/25

Motor Relay Welding Failure

Motor relay circuit malfunction

  • Power steering motor assembly

  • Power steering ECU assembly

On

Ignition switch ON again

WIRING DIAGRAM

C246148E04

CAUTION / NOTICE / HINT

Note:

If the power steering ECU assembly has been replaced, perform assist map writing (Click here).

PROCEDURE

  1. INSPECT TIGHTENING TORQUE OF MOTOR TERMINAL BOLT

    1. Disengage the 4 claws to remove the protector.

      Click here

    2. Check that the motor terminal bolts are tightened to the specified torque.

      Click here

      OK

      The motor terminal bolts are tightened to the specified torque.

    Result

    Proceed to

    OK

    NG
    NG

    TIGHTEN BOLT TO SPECIFIED TORQUE

    Click here

    OK

  2. INSPECT POWER STEERING MOTOR ASSEMBLY

    1. C240264C04

      *1

      Power Steering Motor Assembly

      Remove the power steering motor assembly.

      Click here

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 (PHA) - 2 (PHB)

      25°C (77°F)

      12.7 to 17.2 mΩ

      2 (PHB) - 3 (PHC)

      25°C (77°F)

      12.7 to 17.2 mΩ

      3 (PHC) - 1 (PHA)

      25°C (77°F)

      12.7 to 17.2 mΩ

      1 (PHA) - Motor case

      Always

      10 kΩ or higher

      2 (PHB) - Motor case

      Always

      10 kΩ or higher

      3 (PHC) - Motor case

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE POWER STEERING MOTOR ASSEMBLY

    Click here

    OK

  3. READ VALUE USING GTS (MOTOR TERMINAL VOLT)

    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Start the engine.

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / EMPS / Data List.

    6. Select the items "Motor Terminal Volt (U)", "Motor Terminal Volt (V)" and "Motor Terminal Volt (W)" in the Data List and read the value displayed on the GTS.

      Chassis > EMPS > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Motor Terminal Volt(U)

      Motor terminal voltage (A phase)

      Min.: 0.000 V

      Max.: 98.000 V

      Engine running and steering wheel being turned: Value changes within 4 to 35 V range

      -

      Motor Terminal Volt(V)

      Motor terminal voltage (B phase)

      Min.: 0.000 V

      Max.: 98.000 V

      Engine running and steering wheel being turned: Value changes within 4 to 35 V range

      -

      Motor Terminal Volt(W)

      Motor terminal voltage (C phase)

      Min.: 0.000 V

      Max.: 98.000 V

      Engine running and steering wheel being turned: Value changes within 4 to 35 V range

      -

      Chassis > EMPS > Data List

      Tester Display

      Motor Terminal Volt(U)

      Motor Terminal Volt(V)

      Motor Terminal Volt(W)

    Result

    Result

    Proceed to

    During steering operation, value changes within 4 to 35 V range.

    A

    During steering operation, voltage is not generated.

    B
    A

    REPLACE POWER STEERING ECU ASSEMBLY

    Click here

    B

    REPLACE POWER STEERING MOTOR ASSEMBLY

    Click here